Electric fan

Hello I bought myself a 52 plate TD5 a few months ago the last few days the fan has started as soon as I start the engine I have had it hooked up to a computer and it's coming up with no faults the air con and heater still blows hot air and the temp gauge is still working does anyone have any Idea's thanks Kirky

afaik it can be reset with nanocom in the engine ECU section...untill then take out R3(headlamp wash) and put it instead R4(cooling fan) for test, to make sure that not the relay is stuck

Thank you ill check that out